Adjustable chair



FIG. 1 is a perspective view of an adjustable chair showing the new design;

FIG. 2 is a side elevation view thereof;

FIG. 3 is a side elevation view opposite that shown in FIG. 2 thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for an adjustable chair, as shown and described. 